Commits on Mar 20, 2023

1. Add mempool tracepoints …

   Tracepoints for added, removed, replaced, and rejected transactions.
   
   The removal reason is passed as string instead of a numeric value, since
   the benefits of not having to maintain a redundant enum-string mapping
   seem to outweigh the small cost of string generation.  The reject reason
   is passed as string as well, although here the string does not have to
   be generated but is readily available.
   
   So far, tracepoint PRs typically included two demo scripts: a naive
   bpftrace script to show raw tracepoint data and a bcc script for a more
   refined view. However, as some of the ongoing changes to bpftrace
   introduce a certain degree of unreliability (running some of the
   existing bpftrace scripts was not possible with standard kernels and
   bpftrace packages on latest stable Ubuntu, Debian, and NixOS), this PR
   includes only a single bcc script that fuses the functionality of former
   bpftrace and bcc scripts.

   

   virtu committed Mar 20, 2023
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